Le lun. 2 août 2021 à 23:52, Alex Herbert <alex.d.herb...@gmail.com> a écrit : > > The LogNormalDistribution takes in parameters scale and shape. > > The parameters are the mean and standard deviation of the logarithm of the > random value X. Other libraries use mean (mu) and sigma for the parameters. > These are the parameters used on: > > - Wikipedia: mu, sigma [1] > - Matlab: mu, sigma [2] > - R: meanLog, sdLog [3] > - Wolfram: mu, sigma [4] > > The distribution defines a mean and variance. These are not directly the > values of mu and sigma^2. So using mean as a parameter name is misleading. > However using shape and scale is not standard. No references I found refer > to these parameters as shape and scale parameters. > > I would suggest changing to mu and sigma with the getters getMu and > getSigma. These can be documented as returning the mean and standard > deviation of the logarithm of the random variable X.
Just a name change? +1 Gilles > > Alex > > > [1] https://en.wikipedia.org/wiki/Log-normal_distribution > [2] https://uk.mathworks.com/help/stats/prob.lognormaldistribution.html > [3] https://stat.ethz.ch/R-manual/R-devel/library/stats/html/Lognormal.html > [4] https://reference.wolfram.com/language/ref/LogNormalDistribution.html --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org For additional commands, e-mail: dev-h...@commons.apache.org
